Roof Cleaning in Redmond
Redmond homes near the Sammamish Valley spend a lot of winter mornings in fog, and in Bear Creek many roofs sit under tall trees as well. That steady moisture shows up first as black streaks running down the shingles, usually before any moss appears.
Those black streaks are algae living on your shingles
The dark stripes running down a Redmond roof aren't dirt. They're algae, feeding on the limestone filler in asphalt shingles and holding moisture on the surface. Left alone, the streaks spread and give moss an easy foothold.
Gentle roof cleaning, never pressure washing
Starting at $200 We inspect the full roof, clear moss and debris gently, then apply a roof-safe treatment that kills moss and algae at the root. Anything that comes down into the gutters or onto the ground goes into your yard-waste bin before we leave, and anything extra leaves with us.
A roof that reads as one even color from the street
With the algae and moss treated, the streaks fade as rain rinses the roof, so it stops looking older than it is and the shingles aren't holding a film of moisture through the next foggy winter.
A roof replaced years early costs far more than treatment
Skip treatment a season or two and granule loss keeps compounding, quietly shaving years off a roof that still had a decade left. Staying on a regular treatment cycle costs a fraction of what a new roof does.
Save on your first service — New customers get 10% off.
Save when you bundle — Request multiple services at once. Fewer trips reduce our carbon footprint and lower your bill.
Save when you subscribe — Repeat every 1, 3, 6, or 12 months.
What's included
- Roof inspection. We walk the roof first to check for existing damage and note anything fragile before treatment starts.
- Gentle cleaning. Moss and debris are cleared gently, without a pressure washer or anything that scrapes the shingles.
- Moss treatment. A roof-safe moss treatment kills moss, algae, and lichen at the root, and keeps working with the next rains.
- Ground-level check. We clear gutters and walkways of anything that washed down and put it in your yard-waste bin (anything that doesn't fit is bagged and taken away), then do a final walk-around to check the shaded, high-buildup slopes.
Worth knowing
Older or already-brittle shingles can be more fragile underfoot, and moss that's been established for years may have already lifted or damaged shingles beneath it. We'll let you know if we spot anything like that before we start, rather than treat over a problem that needs a roofer instead.
Frequently Asked Questions
Will the black streaks come right off?
The treatment kills the algae right away, and the streaks fade as the next few rains rinse the roof. Most of the change shows up within a few weeks.
We're near the valley floor and get a lot of fog. Will it come back faster?
Damp, shaded spots do grow algae and moss back sooner than sunny, open ones. For homes in wetter spots, treating about once a year keeps it from getting established.
Will this damage my shingles the way pressure washing would?
No — we never pressure wash roofs. High-pressure water strips the protective granules off asphalt shingles and can void your roofing warranty. We clean gently, without pressure washing or scraping, and a roof-safe moss treatment does the rest, so moss and algae come off without damaging the roofing material underneath.
How often does a roof need moss or algae treatment?
Most Eastside roofs benefit from treatment every 1-2 years. Shaded, north-facing slopes under trees tend to need it more often than sun-exposed sections, since moss spreads fastest wherever moisture lingers.
Other services in Redmond
- Gutter Cleaning
- Move-Out Cleaning
- Driveway Pressure Washing
- Patio & Deck Washing
- Siding & House Washing
- Fence Washing
- Window Cleaning
Roof Cleaning in other Eastside cities
Roof Cleaning across the Eastside · All services · Our service area